Ever tried to explain the important socio-political concept of the Tragedy of the Commons to your toddler? The Internet comes to the rescue with a Macromedia Flash game called the "Tragedy of the Bunnies". When all the bunnies are owned in common, the bunnies all get caught and sold in the first round, because it's in everyone's interest to grab as many as they can, while they can, without regard for the future. Then there aren't any bunnies When everyone has a number of privately owned bunnies, protected against bunny-thieves, each bunny farmer has an incentive to sell a few, but keep most around to multiply.

Hat tip to Iain Murray for the link.